struct.error: unpack requires a string argument of length 8

[alepertu]

Hi, I'm trying to use your scripts, but I'm having trouble running the loader on some .PDOs and I hope you can help me. On some files, I get "struct.error: unpack requires a string argument of length 8" at random times on execution.

For example, running the loader on one of the example files you give, P349.pdo, I get the next error:

Traceback (most recent call last):
  File "loader.py", line 229, in <module>
    parse(data)
  File "loader.py", line 101, in parse
    print 'unk6:', arr(buf.double, buf.double, buf.double, buf.double)
  File "loader.py", line 57, in double
    return self.unpack('d')
  File "loader.py", line 27, in unpack
    ret = struct.unpack(fmt, self.read(struct.calcsize(fmt)))
struct.error: unpack requires a string argument of length 8

I looked around a bit and figured that at that point it runs something like:

struct.unpack(d, self.data[87:95])

And len(self.data[87:95]) should be 8, but printing len(buf.data[87:95]) on the console gives 5, and that doesn't make sense. It happens to other files, at diferent points (for example, while parsing the vertices), and on some files it doesn't happen at all.

I don't know what am I doing wrong, can you help me?